17801-91-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 17801-91-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,8,0 and 1 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 17801-91:
(7*1)+(6*7)+(5*8)+(4*0)+(3*1)+(2*9)+(1*1)=111
111 % 10 = 1
So 17801-91-1 is a valid CAS Registry Number.